Most of the normal microbiota of the digestive system are found in the

Large intestine.

Explanation:

There are some common misconception that all the bacteria can cause disease. They play an important role in the digestion of food.

The large intestines is the home for many different types of bacteria which helps in the absorption, excretion and catalysis of undigested food.

There are many types of prokaryotic and eukaryotic bacteria found in large intestine such as Methanogens, Bifidobacterium,Enterococcus, Clostridium et cetera.

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amber has allowed scientists to study dna that has been preserved over millions of years.